FA-10492 / Caching / Member archive

A not-modified revalidation response replaces the cached body with an empty payload · case 02

A not-modified revalidation response replaces the cached body with an empty payload.

Member previewVariant 2 · 3 implementations · 4 checks per implementation

Case contract

Entry is [body,validated-at]. Response is [modified-or-not-modified,body-or-None,validated-at]. Preserve old body only for not-modified; always update validation time.

Why this case matters

A deterministic cache state transformation. Inputs are copied or treated as immutable; no remote storage, real clock, or concurrent interleaving is simulated.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
fixture 1	`[null, 2]`	`["body", 2]`	Failed

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